core: REE FS: use a single file per object

Prior to this commit each persistent object was represented by a directory with several files. With this commit each persistent object is represented by a single file instead to simplify the implementation. Reviewed-by: Jerome Forissier <[email protected]> Acked-by: Etienne Carriere <[email protected]> Tested-by: Jens Wiklander <[email protected]> (QEMU) Signed-off-by: Jens Wiklander <[email protected]>
OP-TEE · Nov 7, 2016 · 361fb3e · 361fb3e
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commit 361fb3e
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diff --git a/core/include/tee/tee_fs_key_manager.h b/core/include/tee/tee_fs_key_manager.h
@@ -41,11 +41,29 @@
 #define TEE_FS_KM_IV_LEN            12  /* bytes */
 #define TEE_FS_KM_MAX_TAG_LEN       16  /* bytes */
 
+
+#define BLOCK_FILE_SHIFT	12
+
+#define BLOCK_FILE_SIZE		(1 << BLOCK_FILE_SHIFT)
+
+#define NUM_BLOCKS_PER_FILE	1024
+
 enum tee_fs_file_type {
 	META_FILE,
 	BLOCK_FILE
 };
 
+struct tee_fs_file_info {
+	size_t length;
+	uint32_t backup_version_table[NUM_BLOCKS_PER_FILE / 32];
+};
+
+struct tee_fs_file_meta {
+	struct tee_fs_file_info info;
+	uint8_t encrypted_fek[TEE_FS_KM_FEK_SIZE];
+	uint32_t counter;
+};
+
 struct common_header {
 	uint8_t iv[TEE_FS_KM_IV_LEN];
 	uint8_t tag[TEE_FS_KM_MAX_TAG_LEN];